Según / conforme / a medida que for "as / when / at the same time as" (subordinate time clause)

Segúnconforme and a medida que may introduce temporal clauses expressing that the action in the subordinate clause happens at the same time as the action in the main clause. They have a similar function as the more common conjunction mientras.

Let's see some examples:

Según se hacen mayores mis hijos, se vuelven menos comunicativos.As my children grow older, they become less sociable.

Mañana en la reunión, conforme yo apunte los nombres de los asistentes tú les puedes ofrecer café.Tomorrow at the meeting, as I write down the names of the attendees, you can offer them some coffee.

A medida que pasa el tiempo, Luis se anima un poco más.As time goes by, Luis gets more cheerful.

The three conjunctions are interchangeable and they all allow different tenses as well as the subjunctive. Using the subjunctive will depend on the action being seen as a future action. The second example above with conforme reflects a future action (Mañana en la reunión, conforme yo apunte...")

Other examples:

Según vayas conociendo a tus compañeros te sentirás más a gusto en el trabajo.As you get to know your colleagues, you will feel more at ease at work.

A medida que salían de la clase les devolvíamos los móviles a los estudiantes.As they were coming out of the classroom, the students were given their phones back.

Conforme vayan llegando los invitados ofréceles una copa de vino.As the guests arrive, offer them a glass of wine.

It is very common to find these conjunctions with the structure "Ir + gerund", which accentuates the progression of an action. 

See also Según / conforme = as / as per / according to (subordinate manner clause) 

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Examples and resources

A medida que salían de la clase les devolvíamos los móviles a los estudiantes.As they were coming out of the classroom, the students were given their phones back.
Conforme vayan llegando los invitados ofréceles una copa de vino.As the guests arrive, offer them a glass of wine.
Según se hacen mayores mis hijos, se vuelven menos comunicativos.As my children grow older, they become less sociable.
Según vayas conociendo a tus compañeros te sentirás más a gusto en el trabajo.As you get to know your colleagues, you will feel more at ease at work.
A medida que pasa el tiempo, Luis se anima un poco más.As time goes by, Luis gets more cheerful.
Mañana en la reunión, conforme yo apunte los nombres de los asistentes tú les puedes ofrecer café.Tomorrow at the meeting, as I write down the names of the attendees, you can offer them some coffee.
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